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Long-Term Debt - Summary of Company's Current Debt Portfolio (Parenthetical) (Detail)
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6 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | |||
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Jun. 30, 2014
6.75% Senior Notes, due July 2022 [Member]
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Jan. 22, 2014
6.75% Senior Notes, due July 2022 [Member]
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Jun. 30, 2014
7.50% Senior Notes, due August 2020 [Member]
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Dec. 31, 2013
7.50% Senior Notes, due August 2020 [Member]
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Jul. 30, 2013
7.50% Senior Notes, due August 2020 [Member]
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Jun. 30, 2014
9.125% Senior Notes, due April 2018 [Member]
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Dec. 31, 2013
9.125% Senior Notes, due April 2018 [Member]
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Jul. 30, 2013
9.125% Senior Notes, due April 2018 [Member]
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| Debt Instrument [Line Items] | ||||||||
| Debt instrument maturity date | July 2022 | August 2020 | August 2020 | April 2018 | April 2018 | |||
| Debt instrument fixed interest rate | 6.75% | 6.75% | 7.50% | 7.50% | 7.50% | 9.125% | 9.125% | 9.125% |